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kuriv committed Aug 22, 2024
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4 changes: 2 additions & 2 deletions 考研数学/0.预备知识/README.md
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### 函数奇偶性

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f(x) + f(-x) 必是偶函数 \frac{e ^ x + e ^ {-x}}{2}
f(x) + f(-x) 必是偶函数 \frac{e ^ x + e ^ {-x}}{2}\frac{1}{2 ^ x + 1} + \frac{1}{2} .
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f(x) - f(-x) 必是奇函数 \frac{e ^ x - e ^ {-x}}{2}
f(x) - f(-x) 必是奇函数 \frac{e ^ x - e ^ {-x}}{2}\frac{1}{2 ^ x + 1} - \frac{1}{2} .
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